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- var utils = require('../utils')
- , nodes = require('../nodes');
- /**
- * Returns substring of the given `val`.
- *
- * @param {String|Ident} val
- * @param {Number} start
- * @param {Number} [length]
- * @return {String|Ident}
- * @api public
- */
- function substr(val, start, length){
- utils.assertString(val, 'val');
- utils.assertType(start, 'unit', 'start');
- length = length && length.val;
- var res = val.string.substr(start.val, length);
- return val instanceof nodes.Ident
- ? new nodes.Ident(res)
- : new nodes.String(res);
- }
- substr.params = ['val', 'start', 'length'];
- module.exports = substr;
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